For years, the makers of Barbie caught flack for her sexed-up shape; in real life, her measurements would be about 38-19-33. But now My Scene Barbies and Bratz—more bustalicious and hoochie than those old-school dolls—are being marketed to six-year-olds (since their 2001 debut, 125 million Bratz have been sold). Similarly disconcerting: Several years ago, Abercrombie & Fitch sold preteen-size thongs with messages like Eye Candy and Wink, wink. And last fall, tesco.com came under fire for a new toy offering: a pole-dancing kit (now sold solely as a “fitness” item) …